fix: repair tsc/lint breakage introduced across Tasks 6, 11-13

Two independent plan gaps, both surfaced only now because no prior task
in this plan ran a full tsc/lint pass (only scoped vitest per task):

1. Task 6 added required featured/featuredOrder fields to the Product
   type but only updated products.test.ts's fixture. ProductCard.test.tsx
   and InquiryModal.test.tsx also construct Product-typed fixtures and
   were never updated, breaking `tsc -b`/`npm run build`.

2. Tasks 11-13's plan text called the extracted load*() function
   directly from a bare `useEffect(() => { void load*() }, [])`, which
   trips this repo's react-hooks/set-state-in-effect rule. This
   project's established convention (already used in AdminSchedule.tsx)
   wraps the call in an effect-local inner async function instead.

Claude-Session: https://claude.ai/code/session_01NhxA4npAXAxmCDEJt6kxSH

src/components/InquiryModal.test.tsx

@@ -15,6 +15,7 @@ import type { Product } from '../data/products'
 const product: Product = {
   id: 'edge-control', name: 'Silk Edge Control', category: 'hair-care',
   price: 12, image: '/x.jpg', description: 'Hold with shine.', inStock: true,
+  featured: false, featuredOrder: null,
 }
 
 describe('InquiryModal', () => {

src/components/ProductCard.test.tsx

@@ -7,6 +7,7 @@ import type { Product } from '../data/products'
 const product: Product = {
   id: 'edge-control', name: 'Silk Edge Control', category: 'hair-care',
   price: 12, image: '/x.jpg', description: 'Hold with shine.', inStock: true,
+  featured: false, featuredOrder: null,
 }
 
 describe('ProductCard', () => {

src/pages/admin/AdminProducts.tsx

@@ -46,7 +46,10 @@ function AdminProducts() {
   }
 
   useEffect(() => {
-    void loadProducts()
+    async function load() {
+      await loadProducts()
+    }
+    void load()
   }, [])
 
   async function handleSubmit(event: FormEvent) {

src/pages/admin/AdminRules.tsx

@@ -42,7 +42,10 @@ function AdminRules() {
   }
 
   useEffect(() => {
-    void loadRules()
+    async function load() {
+      await loadRules()
+    }
+    void load()
   }, [])
 
   async function handleSubmit(event: FormEvent) {

src/pages/admin/AdminTestimonials.tsx

@@ -34,7 +34,10 @@ function AdminTestimonials() {
   }
 
   useEffect(() => {
-    void loadTestimonials()
+    async function load() {
+      await loadTestimonials()
+    }
+    void load()
   }, [])
 
   async function handleSubmit(event: FormEvent) {